A thicker plate doesn't have any down side that I know of, other than maybe costing a little more. It would help with the capacitor cooling. It's just that I have been using children's safety scissors for cutting out the sheets. haha. 10 mil copper is probably enough in terms of current carrying capacity, but there's no bad side of thicker copper. I will most likely use 32mil copper in general in the future when I get the sheets made professionally. I actually just finished a couple 1400amp 350v DC controllers that used the 32 mil copper sheets, and I really like how they turned out. (thingstodo has one of them.)
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